[appengine-java] Issue with updating owned one to many relationship

[anoop]

Hi,
I am having problem with updating an owned one-to-many relationship.

It seems to me that the relationship is not updated when add a child
during update. The same during create is working fine.
Here is a sample code about which I am talking about,

Parent class:
@PersistenceCapable(detachable="true")
public class Parent {

    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
        private Key key;

        @Persistent
        private String parentId;

        @Persistent
        List<Child> children;

        public Parent(String parentId, List<Child> children) {
                this.parentId = parentId;
                this.children = children;
        }

        // ...

}

Child Class:
@PersistenceCapable(detachable="true")
public class Child {

        @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
        private Key key;

        @Persistent
        private String childId;

        public Child(String childId) {
                super();
                this.childId = childId;
        }

        // ...
}

Test Class:
                String parentId = "parentId3";

                List<Child> children = new ArrayList<Child>();
                children.add(new Child("childId1"));
                Parent parent = new Parent(parentId, children);

                System.out.println("--Create--");
                persist(parent); // There is only one child now - childId1

                System.out.println("--Update--");
                parent = read(parentId);
                parent.getChildren().add(new Child("childId2")); // There are 
two
children - childId1, childId2
                persist(parent);

                System.out.println("--Verify--");
                read(parentId); // ERROR: There is only one child - childId1

In the third step when I try to verify the existence of two children,
I am getting only one!.
Note: I am explicitly detaching the object in both read and persist
methods.

Any help regarding this will be much appreciated. I can zip the
complete code and send if needed.

Thanks,
Anoop

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